D with CygWin

[unDEFER via Digitalmars-d]

So, just another attempt..

=================================
import std.stdio;
import std.string;
import core.sys.windows.winbase;

extern(C)
{
         alias int   function(in char*, int, ...) open_t;
         open_t _my_open;
         extern uint   errno;
}

void main()
{
         writefln("Open Library");
         auto mod = LoadLibrary("C:\\cygwin\\bin\\cygwin1.dll");
         if (mod == null)
         {
                 writefln("Failed load cygwin1.dll");
                 return;
         }

         writefln("Get Proc");
         _my_open = cast(open_t) GetProcAddress(mod, "open");
         if (_my_open == null)
         {
                 writefln("Failed open open symbol");
                 return;
         }

         writefln("_open");
         int res = _my_open(toStringz("/bin/bash"), 0);
         writefln("res=%s errno=%s", res, errno);
}
=================================

The code compiles without problem, BUT without last 2 lines it 
runs, and with last 2 lines it said that executable is corrupted.
Why???